We look at the division of 491557 by 30 
The aim is to understand the frequency of 30 in 491557.

Advancing to step 1:
30 goes into 4 0 times with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 4 leaves us with 4.
Fetch the next digit (9) from the dividend, attach it to 4 and continue: 49 / 30

Advancing to step 2:
The number 30 fits into 49 1 times, leaving a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 1.0
Subtract 30 from 49 to get 19.
Fetch the next digit (1) from the dividend, attach it to 19 and continue: 191 / 30

Moving on to step 3:
191 divided by 30 is 6 with a remainder of 11.
Put 6 as the next digit of the answer. 
Result so far: 16.0
If we take 180 away from 191, we end up with 11.
Append the next digit (5) from the dividend to 11 and continue with: 115 / 30

Going ahead to step 4:
30 goes into 115 3 times with a remainder of 25.
Write down 3 as next digit of the result. 
Result so far: 163.0
If we take 90 away from 115, we end up with 25.
Include the next digit (5) from the dividend after 25, then repeat: 255 / 30

Going ahead to step 5:
30 can be fit into 255 8 times, resulting in a remainder of 15.
Write down 8 as next digit of the result. 
Result so far: 1638.0
If we take 240 away from 255, we end up with 15.
Bring next digit (7) of the dividend behind the 15 and repeat the process: 157 / 30

Going ahead to step 6:
30 goes into 157 5 times with a remainder of 7.
Put 5 as the next digit of the answer. 
Result so far: 16385.0
Subtract 150 from 157 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Advancing to step 7:
30 goes into 70 2 times with a remainder of 10.
Use 2 as the next digit of our solution. 
Result so far: 16385.2
Subtract 60 from 70 to get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 8:
If we divide 100 by 30, we get 3 and a remainder of 10.
Put 3 as the next digit of the answer. 
Result so far: 16385.23
If we subtract 90 from 100, we get 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 9:
When dividing 100 by 30, we get 3 with a remainder of 10.
The number 3 becomes the next digit in our result. 
Result so far: 16385.233
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

After the division, we end up with 16385.233 and a remainder of 0.001.